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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4d82f0f728b8e5fecb921786b1b56d31316e4be0133773e69808bfbe012982' 
  AND token = 'lYMMkGqiCe7QXivSs93C2fvbRUZi4yAQsKoO8KZlBvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}